Fix calculation of row number for selection and URL clicking

When calculating the row that is clicked, for mouse tracking
mFontLineSpacingAndAscent was taken into account, but for selection and
URL clicking it wasn't. This adds a common function for calculating the
column and row which does take it into account and use that for all
three.

I'm not quite sure why it's necessary to subtract
mFontLineSpacingAndAscent, but with this calculation the click location
matches the line that is acted on for me with both touch and mouse and
on different font sizes.

It also removes the offset for finger the selection/url used because I
don't think it's common for apps on Android to have such an offset, and
because the mouse tracking did not use such an offset.

app/src/main/java/com/termux/app/terminal/TermuxTerminalViewClient.java

@@ -177,8 +177,8 @@ public void onSingleTapUp(MotionEvent e) {
         TerminalEmulator term = mActivity.getCurrentSession().getEmulator();
 
         if (mActivity.getProperties().shouldOpenTerminalTranscriptURLOnClick()) {
-            int[] xAndY = mActivity.getTerminalView().getTextSelectionCursorController().getXAndYFromEvent(e);
-            String wordAtTap = term.getScreen().getWordAtLocation(xAndY[0], xAndY[1]);
+            int[] columnAndRow = mActivity.getTerminalView().getColumnAndRow(e, true);
+            String wordAtTap = term.getScreen().getWordAtLocation(columnAndRow[0], columnAndRow[1]);
             LinkedHashSet<CharSequence> urlSet = UrlUtils.extractUrls(wordAtTap);
 
             if (!urlSet.isEmpty()) {

terminal-view/src/main/java/com/termux/view/TerminalView.java

@@ -466,10 +466,31 @@ public boolean isOpaque() {
         return true;
     }
 
+    /**
+     * Get the zero indexed column and row of the terminal view for the
+     * position of the event.
+     *
+     * @param event The event with the position to get the column and row for.
+     * @param relativeToScroll If true the column number will take the scroll
+     * position into account. E.g. if scrolled 3 lines up and the event
+     * position is in the top left, column will be -3 if relativeToScroll is
+     * true and 0 if relativeToScroll is false.
+     * @return Array with the column and row.
+     */
+    public int[] getColumnAndRow(MotionEvent event, boolean relativeToScroll) {
+        int column = (int) (event.getX() / mRenderer.mFontWidth);
+        int row = (int) ((event.getY() - mRenderer.mFontLineSpacingAndAscent) / mRenderer.mFontLineSpacing);
+        if (relativeToScroll) {
+            row += mTopRow;
+        }
+        return new int[] { column, row };
+    }
+
     /** Send a single mouse event code to the terminal. */
     void sendMouseEventCode(MotionEvent e, int button, boolean pressed) {
-        int x = (int) (e.getX() / mRenderer.mFontWidth) + 1;
-        int y = (int) ((e.getY() - mRenderer.mFontLineSpacingAndAscent) / mRenderer.mFontLineSpacing) + 1;
+        int[] columnAndRow = getColumnAndRow(e, false);
+        int x = columnAndRow[0] + 1;
+        int y = columnAndRow[1] + 1;
         if (pressed && (button == TerminalEmulator.MOUSE_WHEELDOWN_BUTTON || button == TerminalEmulator.MOUSE_WHEELUP_BUTTON)) {
             if (mMouseStartDownTime == e.getDownTime()) {
                 x = mMouseScrollStartX;
@@ -1129,7 +1150,7 @@ public void run() {
     /**
      * Define functions required for text selection and its handles.
      */
-    public TextSelectionCursorController getTextSelectionCursorController() {
+    TextSelectionCursorController getTextSelectionCursorController() {
         if (mTextSelectionCursorController == null) {
             mTextSelectionCursorController = new TextSelectionCursorController(this);
 

terminal-view/src/main/java/com/termux/view/textselection/TextSelectionCursorController.java

@@ -88,19 +88,10 @@ public void render() {
         }
     }
 
-    public int[] getXAndYFromEvent(MotionEvent event) {
-        int cx = (int) (event.getX() / terminalView.mRenderer.getFontWidth());
-        final boolean eventFromMouse = event.isFromSource(InputDevice.SOURCE_MOUSE);
-        // Offset for finger:
-        final int SELECT_TEXT_OFFSET_Y = eventFromMouse ? 0 : -40;
-        int cy = (int) ((event.getY() + SELECT_TEXT_OFFSET_Y) / terminalView.mRenderer.getFontLineSpacing()) + terminalView.getTopRow();
-        return new int[] { cx, cy };
-    }
-
     public void setInitialTextSelectionPosition(MotionEvent event) {
-        int[] xAndY = getXAndYFromEvent(event);
-        mSelX1 = mSelX2 = xAndY[0];
-        mSelY1 = mSelY2 = xAndY[1];
+        int[] columnAndRow = terminalView.getColumnAndRow(event, true);
+        mSelX1 = mSelX2 = columnAndRow[0];
+        mSelY1 = mSelY2 = columnAndRow[1];
 
         TerminalBuffer screen = terminalView.mEmulator.getScreen();
         if (!" ".equals(screen.getSelectedText(mSelX1, mSelY1, mSelX1, mSelY1))) {